The Electricity Cost Calculator estimates how much it costs to run electrical appliances based on their wattage, usage time, and your local electricity rate. It helps you identify energy-hungry devices, compare the running cost of different appliances, and find ways to reduce your electricity bill.
How the Formula Works
Cost = (Wattage × Hours of use per day × Days) ÷ 1000 × Electricity rate per kWh. kWh = kilowatt-hours.
How to Use This Calculator
Enter the appliance wattage (found on the label or manual)
Enter hours of daily use
Enter your electricity rate ($/kWh)
View daily, monthly, and annual running costs
Tips & Best Practices
Switching from incandescent (60W) to LED (10W) bulbs can save $8–10 per bulb per year
Unplug chargers and devices when not in use — 'vampire power' can add 5–10% to your bill
Run dishwashers and washing machines during off-peak hours if your utility offers time-of-use rates
A programmable thermostat can save 10–15% on heating and cooling costs annually
Important Limitations
Actual consumption may differ from rated wattage (e.g., refrigerators cycle on and off)
Does not account for variable electricity rates (tiered pricing, time-of-use rates)
Wattage varies by settings — a fan on low uses much less than on high